I don't have any experience with molitium. Sorry.

But I'm glad your DH is giving you the chance to try. It will be easier for you without the added stress from him.
Dont forget that because BM is so much better for them, it is much easier to digest & so they will feed more often. BF is anywhere from every 2 hours where as ff is around every 4 hours.
So if it's because she is feeding more then that might be why.
They also usually will go through an unsettled period at around 6 weeks. They will usually have a growth spurt & just will be generally unhappy for a few days no matter how they are fed.
Keep up the good work!!